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AIRCOSAVER

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Improving energy efficiency is the best short-term answer to today’s energy problems.

Until cleaner and sustainable sources of energy become available on a large scale, improving the energy efficiency of today’s systems is the best way to reduce co 2 emissions and save energy.

The best thing is: Everyone can contribute!

Air Conditioning has a huge potential for efficiency improvements

Air conditioning is one of the largest energy consumers in the residential and industrial sector. Thousands of Air Conditioners put high demands on the electricity networks. On a smaller scale, air conditioning probably accounts for a significant part of your energy bill.

Many existing air conditioners use old and quite inefficient technology. Although improved technology has become available in more expensive systems (e.g. inverter technology), the payback time of these systems is still very long.

Instead of investing a lot of money into an expensive new system, there is an easy and affordable way to improve the energy efficiency of your unit…

Upgrade it with an AircoSaver

What is an AircoSaver?

It is a retrofit product that adds intelligence to

air-conditioning systems, which saves KWh and extends compressor life.

*AircoSaver is engineered and Manufactured in Germany for 9 plus years.

How does the AircoSaver Work?

Shortcomings of a Typical AC System

When switched on, typical air conditioning systems operate continuously until the room thermostat senses the desired temperature and turns the system off. As the room warms up, the thermostat switches the air conditioner back on and the cycle repeats

Air conditioning systems are usually dimensioned to cope with the extreme cooling demands of the few hottest days of the year (plus a safety margin). However, in most operational conditions, this maximum output is not required and the system is oversized. So running the system continuously until the room thermostat switches it off means that the system operates with excess capacity most of the time.

A typical cooling cycle with excess capacity looks like this:

When the cycle starts, the compressor pushes cooling energy into the heat exchanger which acts as an energy storage. At this stage, the system works with high efficiency because compressors operate most efficiently when fully loaded.

In normal weather conditions, the energy storage Is soon fully “charged up”. From this point onwards, the compressor provides more cooling energy than the heat exchanger can take up (thermodynamic saturation).

Running the compressor beyond this stage does NOT increase the cooling effect any more.

It’s Just a Waste of energy!

The AircoSaver compensates these shortcomings and adds intelligence to your AC Systems

This is where the AircoSaver cuts in. It’s sensor driven software algorithms are designed to detect thermodynamic saturation and to optimize the compressor accordingly. When overcapacity is detected, the AircoSaver switches the compressor off and avoids inefficient overcooling.

Your unit switches into “saver mode”. The fan keeps running and your system makes maximum use of the stored cooling energy in the heat exchanger. Once the stored energy is used up, the compressor can work efficiently again and is switched back on.

The set room temperature is reached without the inefficient parts of the cooling cycle. This results in significant energy savings without compromising cooling comfort.

Since the correct point to switch the compressor varies from unit to unit and changes with different weather conditions, the AircoSaver is constantly adapting its settings to ensure efficient operation of your air conditioning system at all times.

A very simple AircoSaver Analogy

Imagine a sink with a drain and tap

The tap can only be turned full on or completely off. Nothing in-between.

The tap usually can deliver more water than the drain can take (partial loads).

So when the tap is turned on, the water in the sink will rise

The aim is to achieve a constant flow out of the drain without spilling any water.

The water level rises and rises

At one stage the water will start to spill over the sink (thermodynamic saturation)

At this stage the tap can be turned off and the water in the sink will continue to flow out of the drain.

Later, the tap is turned on again before the sink is empty and the sink fills up again.

So, no spillage-that means best efficiency.

The AircoSaver will work in all types of AC systems, typically up to 20 tons.

Package Units (RTU)

Split Systems

PTAC

Window Units

Wall Units

Approximate increase in efficiency with the installation of the AircoSaver

Savings Potential

This table shows the equivalent increase in the efficiency (Energy Efficiency Rate “EER”) of Air Conditioning installed after AircoSaver. For example, an AC with an EER of 10, taking AircoSaver with savings of 30%, increases its efficiency to an EER of 14.

Let’s take a look at some actual AircoSaver “Before and After” Test Results…

AircoSaver SavingsDomino’s Store # 6711San Antonio, TX

* Per month data is based on a 30 day month

COMMENTS: The average temperature, relative humidity and heat index were all higher after the AircoSavers were installed which lowered the overall savings. Also, the KW Demand savings was almost 7%, but was not figured into the savings listed above. The data above was compiled from the following sources: CPS Energy monthly electric bills for Jun, Jul, and Aug 2008. The weather data was downloaded from weatherunderground.com station KTXSANAN78.

Call SEP for a copy of this report

90 Min. Before & After test

In 24 hr. operational site

AircoSaver Test3 ton Bard wall unit in Telecom HutDallas, TX06-09-09

Intercept Y1 from thermostat and re-route through AircoSaver

Y1

Thermostat

AircoSaver

Installation

Control Board

Supply 24V to AircoSaver

AircoSaver

24 Volts

Y1

Compressor

Blower

Supply Air

Install sensor in supply Air Flow or on evaporator

(whichever is coldest)

Evaporator

Return Air

* Contact SEP for a copy of this report

Page 5 of 5

Calculation Methods

At each site, air conditioner supply voltage was recorded. Air conditioner power was derived from the formula- (measured volts X measured amps X assumed power factor of .85) = power. Only one site, SD0364 was supplied with three phase power for air conditioners. The three phase power conversion factor of 1.732 was used to calculate power consumption at that site. Pre period average hourly power consumption was compared to post period average hourly power consumption and the result was annualized to determine annual energy savings. No air conditioner performance corrections were made for increased ambient (external) temperature. At eight of the nine sites average temperature during the post period was higher than during the baseline test period. An examination of compressor kW VS ambient temperature showed little difference.

Project Results and Discussion

Average hourly power savings was calculated for each site and extrapolated to annual energy savings. Overall air conditioning savings was 20% of baseline air conditioner energy consumption, and averaged 7071 kWh for the nine sites. Energy savings averaged 6.8% of site total energy consumption.

The Aircosaver control system may be incentivized through the Standard Performance Contract Program at nine cents per annual kWh saved. The incentive is limited to ½ the installed cost, or the calculated incentive, whichever is less.

At an average site electric cost of 14.4 cents/kWh Annual energy savings for installing the AircoSaver at each site is around $1,000 per year.